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Message: <blockquote data-quote="bmw7833" data-source="post: 10322" data-attributes="member: 4089"><p>I changed my cooling coil as u know last week..But the new problem appear!! Sometime i start my car and switch on the aircon, it is normal and under control; but sometime i start my car and switch on the aircon, it is totally out of control--hot air came out (same like the hot air b4 i changed my cooling coil)..I go back to Two-B and check for 3 times, what their said was, this is normal!!<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek!    :eek:" loading="lazy" data-shortname=":eek:" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek!    :eek:" loading="lazy" data-shortname=":eek:" /> The boss recommend to block the heater or changed the heater valve..But now the problem is, if i block the heater, i can not adjust the temperature anymore (that means 16 deg = 26 deg)..So, 1. Who ever block the heater??2. Who ever changed the heater valve??I call to Naidu, he said for single vanos car, better dun touch the heater..So how??Before i open a new thread to criticism Two-B :thumpdown:,  i want to hear what are u all say..Pls give ur opinion..My car is e39 523i single vanos..</p></blockquote><p></p>